{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7120-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7120-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7120-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7120-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7120-8, miniature circuit breaker, 1-pole, D tripping characteristic, 20 A rated current, 400 V AC, 15 kA (EN 60898) / 25 kA (IEC 60947-2), 18 mm wide, 1 width unit.","salesMarkdown":"## What the D-curve and 20 A rating mean on site It's a current-production part (lifecycle stage: current), so no last-time-buy scramble; you can specify it into a new panel or drop it into a retrofit without worrying about obsolescence. At 400 V AC, that 25 kA SCCR gives you headroom for high-fault installations without cascading upstream. For DC circuits, it's rated 15 kA at 72 V DC per IEC 60947-2, and 5 kA under UL 1077 / CSA C22.2 No. 235 for North American acceptance. At 18 mm wide (1 width unit), it's a standard single-module MCB that snaps onto DIN rail without needing extra side space. The touch-protected terminals (IP20 with connected conductors) keep fingers away from live parts inside the enclosure — fine for a panel that gets opened for troubleshooting. Humidity derating is specified: max 95% RH up to 55 °C, dropping to 55% at 70 °C and 35% at 75 °C. In a non-climate-controlled panel near a washdown zone, that's the limit to watch — keep the cabinet ventilated if ambient humidity sits high alongside elevated temps. The design is the 5SY7 series, a compact single-pole MCB family that shares the same footprint and terminal layout across the D-curve range.","metaTitle":"Siemens 5SY7120-8 SENTRON MCB, 1P D 20 A, 15/25 kA","metaDescription":"Siemens 5SY7120-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 20 A rated, 400 V AC, 15 kA (EN 60898) / 25 kA (IEC 60947-2), 18 mm wide. Current production; RFQ for price an","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY7120-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 230/400 V 15kA, 1-pole, D, 20 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY7","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"20 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"15 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"25 kA","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ab2482f0df8f28ac431aa73b532e6fe4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=526101&mlfb=5SY7120-8"},"ai":{"faq":[{"question":"Where can I buy 5SY7120-8 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What is 5SY7120-8's listed depth (76 mm) on this component line?","answer":"The overall depth is 76 mm; the installation depth behind the panel face is 70 mm. That 6 mm difference is the front protrusion past the DIN rail."},{"question":"What compliance documentation does this brand provide for 5SY7120-8 (RoHS, REACH, UL, IEC)?","answer":"The part carries IEC 60947-2 and EN 60898 ratings, plus UL 1077 and CSA C22.2 No. 235 certification. The housing is halogen-free and silicon-free, which aligns with RoHS/REACH material restrictions. Standard Siemens declaration of conformity covers the rest."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7120-8","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SY7120-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}